It’s telling you right on screen. Battery service recommended.

Means the battery’s shot. They don’t last forever.

Google how to replace it yourself, see if you’re up for it. If not, find a service to do it. Doesn’t have to be (probably shouldn’t be) the Apple Store. You’re LOONG out of warranty.

I snagged lemmyw.ink to roll one soon. Lemmiw.ink, too, for good measure.

I was very tickled with myself.